Lower, Mark A (1860) Patronymica Britannica: a dictionary of the family names of the United Kingdom. London: J.R. Smith. Public Domain.
FURNACE
As described in historical dictionaries
Patronymica Britannica (1860)
FURNACE. Probably from Furness, CO. Lancaster, celebrated for its fine monastery ; perhaps, hovever, from residence near some great iron-furnace, before tlio existing method of smelting that metal was introduced.